Abstract
The present study, combining UV–Visible absorption and 3D fluorescence supported by PARAFAC chemometric analysis, focused on the characterization of soil water extractable organic matter (WEOM) in the zone of Doukkala located near the Atlantic coast of Morocco. The extracts, in water, of a set of 30 samples covering the four main types of agricultural soils in the region (commonly labeled Tirs, Faid, Hamri and R’mel) were investigated. \({\mathrm{E}}_{2}/{\mathrm{E}}_{3}\) and \({\mathrm{E}}_{4}/{\mathrm{E}}_{6}\) absorbance ratios \(, {\mathrm{S}}_{275-295}\) and \({\mathrm{S}}_{350-400}\) spectral slopes, along with their ratios\({\mathrm{S}}_{\mathrm{R}}\), as well as the fluorescence \(\mathrm{FI}\) and humification \(\mathrm{HIX}\) indices were calculated and interpreted. In the four soil types, these parameters revealed, on the one hand, organic materials of terrigenous origin with some biological component, and showed, on the other hand, that these materials are in similar stages of humification with an important humic character. In all the soils investigated, 3D fluorescence crossed with PARAFAC chemometrics highlighted the absence of any protein component and revealed the prevalence of the fulvic acids fraction in the organic matter humic material.
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References
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This work has been supported by the Moroccan CNRST (Centre National pour la Recherche Scientifique et Technique) [URL-CNRST N°7].
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Hassan Ba-Haddaou: (Experimental investigations, first draft preparation and submission). Hicham Hassoun: (Sampling, material preparation and experimental investigations). Salim Foudeil: (Data collection, first draft preparation and submission). Abdelmajid El Bakkali : (Manuscript revision and figures preparation). Saadia Ait Lyazidi: (Supervision, methodology, final draft reviewing and project administration). Mustapha Haddad: (Discussion, validation and funding acquisition). Matthieu Masson: (Discussion and validation). Marina Coquery: (Discussion and validation). Christelle Margoum: (Experimental logistics, discussion and validation). All authors read and approved the final manuscript.
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Ba-Haddou, H., Hassoun, H., Foudeil, S. et al. Combination of 3D Fluorescence/PARAFAC and UV–Vis Absorption for the Characterization of Agricultural Soils from Morocco. J Fluoresc 32, 2141–2149 (2022). https://doi.org/10.1007/s10895-022-03011-3
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DOI: https://doi.org/10.1007/s10895-022-03011-3